Hair gels vary in how effectively they hold your hair together. Apparently someone somewhere has developed a 0-10 scale for categorizing this quality because when I was shopping for hair gel, some had ratings slapped on them. Currently, I’m rocking a Level 7 – “strong.” This was the lowest number I could find at the store. I’ve yet to see anything below that, though I suspect there’s “medium” (Level 5?) and “weak” (Level 3?). Level 0, the baseline, is probably water.
Are there gels with negative ratings? Gels that would mess up your hair rather than hold it together? If so, then Level -1 would probably be the equivalent of a gentle breeze. Level -5 would be a hurricane. A Level -9 would chop your head off like a guillotine. A Level -10 would disintegrate it on contact. [Developed by the Soviets, no doubt.]
Going in the opposite direction, Level 8 is “super” hold, Level 9 is “mega” hold, and Level 10 is “supreme” hold. [That's "uber" hold in German.]
Purportedly, the Iranians are developing a Level 12 hair gel that will not only style your hair effectively, but refine uranium, too.